BS EN ISO 9300:2005
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Measurement of gas flow by means of critical flow Venturi nozzles
Hardcopy , PDF
20-08-2022
English
21-10-2005
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
CPI/30/2
|
| DevelopmentNote |
Renumbers and supersedes BS 1042-1.3(1991) 1995 version incorporates amendment 8878 to BS 1042-1.3(1991) Supersedes 89/20802 DC (09/2005) Supersedes 03/314394 DC (11/2005)
|
| DocumentType |
Standard
|
| Pages |
48
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
This International Standard specifies the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow-rate of a gas flowing through a system. It also gives the information necessary for calculating the flow-rate and its associated uncertainty.
It is applicable to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local sonic velocity), and only where there is steady flow of single-phase gases. At the critical velocity, the mass flow-rate of the gas flowing through the Venturi nozzle is the maximum possible for the existing upstream conditions while CFVN can only be used within specified limits, e.g. Iimits for the nozzle throat to inlet diameter ratio and throat Reynolds number. This International Standard deals with CFVN for which direct calibration experiments have been made in sufficient number to enable the resulting coefficients to be used with certain predictable limits of uncertainty.
Information is given for cases where the pipeline upstream of the CFVN is of circular cross-section, or it can be assumed that there is a large space upstream of the CFVN or upstream of a set of CFVN mounted in a cluster. The cluster configuration offers the possibility of installing CFVN in parallel, thereby achieving high flow-rates.
For high-accuracy measurement, accurately machined Venturi nozzles are described for low Reynolds number applications.
| Standards | Relationship |
| ONORM EN ISO 9300 : 2005 | Identical |
| UNI EN ISO 9300 : 2005 | Identical |
| DIN EN ISO 9300:2005-11 | Identical |
| NS EN ISO 9300 : 2ED 2005 | Identical |
| SN EN ISO 9300 : 2005 | Identical |
| NF EN ISO 9300 : 2005 | Identical |
| UNE-EN ISO 9300:2006 | Identical |
| NEN EN ISO 9300 : 2005 | Identical |
| NBN EN ISO 9300 : 2005 | Identical |
| I.S. EN ISO 9300:2005 | Identical |
| ISO 9300:2005 | Identical |
| EN ISO 9300:2005 | Identical |
| ISO 6976:2016 | Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition |
| ISO 5168:2005 | Measurement of fluid flow — Procedures for the evaluation of uncertainties |
| ISO 5167-2:2003 | Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2: Orifice plates |
| ISO 5167-1:2003 | Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.